Alert archive / New Jersey / Flash Flood Watches in 2011
Flash Flood Watch 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at May 20, 2011, 3:30 AM EDT for Carbon County, Monroe County, Northampton County, Pennsylvania; 5 counties in New Jersey. It took effect at May 20, 2011, 12:00 PM EDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 20, 2011, 3:30 AM EDT (07:30 UTC)
- In effect from
- May 20, 2011, 12:00 PM EDT
- Expired
- May 20, 2011, 6:08 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Carbon County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 07:32 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 7.5 hours before the alert went out and 181 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 72 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 1162 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
477 WGUS61 KPHI 200730 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 330 AM EDT FRI MAY 20 2011 NJZ001-007>010-PAZ054-055-062-202100- /O.NEW.KPHI.FF.A.0002.110520T1600Z-110521T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-CARBON-MONROE-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...JIM THORPE...STROUDSBURG...BETHLEHEM... EASTON 330 AM EDT FRI MAY 20 2011 ...FLASH FLOOD WATCH IN EFFECT FROM NOON EDT TODAY THROUGH THIS EVENING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY... HUNTERDON...MORRIS...SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA...CARBON...MONROE AND NORTHAMPTON. * FROM NOON EDT TODAY THROUGH THIS EVENING * SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND EVENING COULD PRODUCE LOCALLY HEAVY RAINFALL. MORE THAN AN INCH OF RAIN COULD FALL IN LESS THAN AN HOUR WITH SOME STORMS. WITH SOILS SATURATED BY HEAVY RAIN THURSDAY AFTERNOON AND EVENING...THE ADDITIONAL RAINFALL COULD RESULT IN FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ HAYES
2 follow-up statements
346 WGUS61 KPHI 201856 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 256 PM EDT FRI MAY 20 2011 NJZ001-007>010-PAZ054-055-062-210000- /O.CON.KPHI.FF.A.0002.000000T0000Z-110521T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-CARBON-MONROE-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...JIM THORPE...STROUDSBURG...BETHLEHEM... EASTON 256 PM EDT FRI MAY 20 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY...HUNTERDON...MORRIS... SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA...CARBON... MONROE AND NORTHAMPTON. * UNTIL 8 PM EDT THIS EVENING * SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND EVENING COULD PRODUCE LOCALLY HEAVY RAINFALL. MORE THAN AN INCH OF RAIN COULD FALL IN LESS THAN AN HOUR WITH SOME STORMS. WITH SOILS SATURATED BY HEAVY RAIN THURSDAY AFTERNOON AND EVENING...THE ADDITIONAL RAINFALL COULD RESULT IN FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ KRUZDLO
482 WGUS61 KPHI 202208 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 608 PM EDT FRI MAY 20 2011 NJZ001-007>010-PAZ054-055-062-202315- /O.CAN.KPHI.FF.A.0002.000000T0000Z-110521T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-CARBON-MONROE-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...JIM THORPE...STROUDSBURG...BETHLEHEM... EASTON 608 PM EDT FRI MAY 20 2011 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NEW JERSEY AND PENNSYLVANIA HAS BEEN CANCELLED. SCATTERED SHOWERS AND AN ISOLATED THUNDERSTORM ARE STILL POSSIBLE OVER THE AREA THIS EVENING. NOTE THAT FLOOD WARNINGS REMAIN IN EFFECT FOR PORTIONS OF THE PASSAIC AND ROCKAWAY RIVERS IN NORTHERN NEW JERSEY. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 11:23 PM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 3 hr |
| May 20, 2:07 AM EDT | Areal Flood Advisory | PHI | Monroe | 3 hr |
| May 20, 2:52 AM EDT | Special Weather Statement | PHI | Monroe | 53 min |
| May 20, 5:45 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| May 20, 6:40 PM EDT | Special Weather Statement | PHI | Monroe | 65 min |
| May 19, 8:36 PM EDT | Special Weather Statement | PHI | Atlantic | 54 min |
| May 19, 9:26 PM EDT | Special Weather Statement | PHI | Ocean | 94 min |
| May 20, 11:59 AM EDT | Special Weather Statement | PHI | Burlington, Camden, Gloucester, Monmouth | 46 min |
Nearby
Flash Flood Watches in New Jersey, 2011Flash Flood Watches in Pennsylvania, 2011Every flash flood watch in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.